Conversion of Phylloquinone (Vitamin K1) into Menaquinone-4 (Vitamin K2) in Mice

Toshio Okano, Yuka Shimomura, Makiko Yamane, +4

Journal of Biological Chemistry

Vitamin NutritionBiochemistryPhylloquinone IntakeVitamin K2Liver Physiology +11

Vitamin K Content of Foods and Dietary Vitamin K Intake in Japanese Young Women

Maya Kamao, Yoshitomo Suhara, Naoko Tsugawa, +6

Journal of Nutritional Science and Vitaminology

NutritionJapanese Young WomenPublic Health NutritionVitamin KVitamin K Content +17

C-3 Epimerization of Vitamin D3 Metabolites and Further Metabolism of C-3 Epimers

Maya Kamao, Syuichiro Tatematsu, Susumi Hatakeyama, +7

Journal of Biological Chemistry

Determination of 25-Hydroxyvitamin D in Human Plasma Using High-Performance Liquid Chromatography−Tandem Mass Spectrometry

Naoko Tsugawa, Yoshitomo Suhara, Maya Kamao, +1

Analytical Chemistry

Menadione (Vitamin K3) Is a Catabolic Product of Oral Phylloquinone (Vitamin K1) in the Intestine and a Circulating Precursor of Tissue Menaquinone-4 (Vitamin K2) in Rats

Yoshihisa Hirota, Naoko Tsugawa, Kimie Nakagawa, +9

Journal of Biological Chemistry

Vitamin K AntagonistsBiochemistryVitamin K2MedicinePhysiology +4

Vitamin K status of healthy Japanese women: age-related vitamin K requirement for γ-carboxylation of osteocalcin

Naoko Tsugawa, Masataka Shiraki, Yoshitomo Suhara, +3

American Journal of Clinical Nutrition

Vitamin K AntagonistsNutritionBone DiseaseBone HealthVitamin K Status +8

Method for the Determination of Vitamin K Homologues in Human Plasma Using High-Performance Liquid Chromatography-Tandem Mass Spectrometry

Yoshitomo Suhara, Maya Kamao, Naoko Tsugawa, +1

Analytical Chemistry

High prevalence of vitamin K and D deficiency and decreased BMD in inflammatory bowel disease

Akiko Kuwabara, Kiyoshi Tanaka, N. Tsugawa, +8

Osteoporosis International

InflammationChronic Inflammatory DiseasesNutritionD DeficiencyAutoimmune Disease +9

Quantification of fat-soluble vitamins in human breast milk by liquid chromatography–tandem mass spectrometry

Maya Kamao, Naoko Tsugawa, Yoshitomo Suhara, +8

Journal of Chromatography B

Food ChemistryNutritionHuman Breast MilkBiochemistryFat-soluble Vitamins +8

Low plasma phylloquinone concentration is associated with high incidence of vertebral fracture in Japanese women

Naoko Tsugawa, Masataka Shiraki, Yoshitomo Suhara, +4

Journal of Bone and Mineral Metabolism

Bone DiseaseSkeletal TraumaVertebral FractureBone HealthJapanese Women +5